On YouTube I saw this video a while back:
I thought these look really cute and are very functional. However, when I think of luggage, the Rimowa kind of luggage comes to my mind, with the ridges and all.
Then one day, my brother gave me his broken RFID blocking card case. It won't keep shut anymore so he thought that maybe I could fix it or something. Then I thought, wow this looks like a mini luggage bag. Then it hit me:
(Photos from the net)
Don't they look like they could pass off as colourful Rimowa luggage bags? but thinner? Sure, they still need modification, but I think they might just work.